Earplug or similar article



FIG. 1 is a perspective view of an earplug or similar article showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is an end elevational view thereof; and

FIG. 4 is an end elevational view thereof, opposite that shown in FIG. 3. 

The ornamental design for an earplug or similar article, as shown. 